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Working as iPhone/iPad and C# developer


Sep
11
comment $F(\frac{1} {x})=x^3 - 2$; what is $F(\frac{x} {y})$?
In mathematics, you should not assume definitions that are not given. The question does not define the function to be f:ℝ->ℝ. And it obviously has a value that is undefined, that does not make the result be wrong. Note that the result of this function may not stay that way, the function may be transformed and the undefined result may suddenly become a well-formed result.
Sep
11
comment $F(\frac{1} {x})=x^3 - 2$; what is $F(\frac{x} {y})$?
@user37238 I also can define functions with undefined results. For example, division would be one of those functions. f(x,y)=x/y may be undefined for y=0
Sep
11
comment $F(\frac{1} {x})=x^3 - 2$; what is $F(\frac{x} {y})$?
@user37238 If I define a function as f(x)=x/0, what would be f(5)?
Sep
11
comment $F(\frac{1} {x})=x^3 - 2$; what is $F(\frac{x} {y})$?
@user37238 Division by zero may be undefined (depending on the mathematical setting), but it is not incorrect.
Sep
11
comment $F(\frac{1} {x})=x^3 - 2$; what is $F(\frac{x} {y})$?
@RobertLewis It would also be correct for x=0. Why should it be wrong?, also 0! = 1 :P
Jul
17
awarded  Supporter
Jul
17
comment How to convince a math teacher of this simple and obvious fact?
Absurdity is actually the correct word. Since it was demostrated by "Reductio ad absurdum". Upvote, I learned something new :)
Jul
17
comment How to convince a math teacher of this simple and obvious fact?
it is not absurd, it is a contradiction. Just saying...
Apr
11
comment What is the real life use of hyperbola?
hyperbolas in real life
Apr
16
awarded  Autobiographer